| Solar radiation (3) |  |
| Solar wind (1) | |
| Sun (37) | |
| Sunlight (48) | |
| Solar radiation (3) | |
| Solar wind (1) | |
| Sun (37) | |
| Sunlight (48) | |
Using solar wind, and other forms of passive energy, our future water networks will be operate with far more efficiency and convenience than anything imaginable today.
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